This review is from AVERY Maroon Border Business Card, 10 per sheet (for glossy cards with center margin):

The maroon border accents the business card in a way that emphasizes and highlights your business card information. Red kind of related to a stop sigh or a warning sign, which seems to get one's attention; getting them interested and curious enough to read the card when they just happen to come across it. Its uniqueness also attracts attention.